<template>
  <div class="app-container">
    <!-- 输入表单 -->
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name" />
      </el-form-item>
      <el-form-item label="入驻时间">
        <el-date-picker v-model="teacher.joinDate" value-format="yyyy-MM-dd" />
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" :min="0"/>
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
            -->
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro"/>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career" :rows="10" type="textarea"/>
      </el-form-item>

      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">
        <el-upload
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
          :before-upload="beforeAvatarUpload"
          :on-error="handleAvatarError"
          :action="BASE_API+'/admin/vod/file/upload?module=avatar'"
          class="avatar-uploader">
          <img v-if="teacher.avatar" :src="teacher.avatar">
          <i v-else class="el-icon-plus avatar-uploader-icon"/>
        </el-upload>
      </el-form-item>

      <el-form-item>
        <el-button type="primary" @click="saveOrUpdate()">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import teacherApi from '@/api/vod/teacher'
export default {
  data(){
    return{
      teacher:{        
        sort: 0,
        level: 1
        },
        BASE_API: 'http://localhost:8333'
    }
  },
  created(){
    //获取路径的id，根据id查询得到数据
    if(this.$route.params.id){
      const id = this.$route.params.id
      this.fetchDataById(id)
    }
  },
  methods:{
        // 上传成功回调
    handleAvatarSuccess(res, file) {
      // console.log(res)
      if (res.code==20000) {
        // console.log(res)
        this.teacher.avatar = res.data
        // 强制重新渲染
        this.$forceUpdate()
      } else {
        this.$message.error('上传失败 （非0）')
      }
    },

    // 错误处理
    handleAvatarError() {
      console.log('error')
      this.$message.error('上传失败（http失败）')
    },

    // 上传校验
    beforeAvatarUpload(file) {
      const isJPG = file.type === 'image/jpeg'
      const isLt2M = file.size / 1024 / 1024 < 2

      if (!isJPG) {
        this.$message.error('上传头像图片只能是 JPG 格式!')
      }
      if (!isLt2M) {
        this.$message.error('上传头像图片大小不能超过 2MB!')
      }
      return isJPG && isLt2M
    },

    //根据id查询讲师
    fetchDataById(id){
      teacherApi.getTeacherById(id)
      .then(response =>{
        this.teacher = response.data
      })
    },
    
    //添加
    save(){
      //添加
      teacherApi.saveTeacher(this.teacher)
      .then(response =>{
        //提示
        this.$message({
            type: 'success',
            message: '添加成功!'
        });
        //跳转到列表
        this.$router.push({path:'/vod/teacher/list'})
      })
    },

    //修改
    update(){
      //添加
      teacherApi.updateTeacher(this.teacher)
      .then(response =>{
        //提示
        this.$message({
            type: 'success',
            message: '修改成功!'
        });
        //跳转到列表
        this.$router.push({path:'/vod/teacher/list'})
      })
    },

    //添加和修改
    saveOrUpdate(){
      if(!this.teacher.id){//没有id，添加
      this.save()
      }else{//有id，修改
      this.update()
      }
    }
  }
}
</script>